CN113452452B - Broadband high-sensitivity millimeter wave receiving system based on carrier suppression - Google Patents
Broadband high-sensitivity millimeter wave receiving system based on carrier suppression Download PDFInfo
- Publication number
- CN113452452B CN113452452B CN202110702603.6A CN202110702603A CN113452452B CN 113452452 B CN113452452 B CN 113452452B CN 202110702603 A CN202110702603 A CN 202110702603A CN 113452452 B CN113452452 B CN 113452452B
- Authority
- CN
- China
- Prior art keywords
- signal
- intensity modulator
- carrier
- millimeter wave
- carrier suppression
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/63—Homodyne, i.e. coherent receivers where the local oscillator is locked in frequency and phase to the carrier signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a broadband high-sensitivity millimeter wave receiving system based on carrier suppression, wherein: the carrier-rejection based dual wavelength generation architecture comprises: a single-tone signal generated by a microwave source directly drives an intensity modulator, and the intensity modulator works at a carrier suppression point to generate two coherent wave beams; the microwave photon down-conversion structure based on the intensity modulator comprises: modulating a radio frequency carrier signal to a beam of light wave in a carrier suppression dual-wavelength generating structure by using an intensity modulator, and reserving a-1 order sideband by using Bragg fiber grating filtering; the homodyne coherent detection unit includes: and performing homodyne coherent detection by using another beam of light wave generated by the carrier suppression dual-wavelength generating structure and a-1-order sideband output by the down-conversion of the microwave photons to realize photoelectric conversion and complete the demodulation from the millimeter wave radio frequency signal to a baseband signal. The invention realizes down conversion of any millimeter wave radio frequency signal, supports millimeter wave wireless communication large-capacity and long-distance transmission, has simple principle and stronger application value.
Description
Technical Field
The invention relates to the technical field of on-chip microwave photonics, in particular to a broadband high-sensitivity millimeter wave receiving system based on carrier suppression.
Background
In order to realize wireless communication with higher speed and larger bandwidth, communication frequency is evolved to a higher frequency band, and a millimeter wave band is a development direction of future wireless communication due to available spectrum resources of several GHz. The method is restricted by the processing rate of baseband signals and the bottleneck of an analog-digital/digital-analog conversion device, and directly detects millimeter wave radio frequency signals with a logarithmic GHz bandwidth, relates to electric domain frequency mixing and filtering, and has high device cost and great difficulty. The millimeter wave radio frequency signal can be directly converted to a baseband based on the microwave photon down-conversion technology, the characteristics of large bandwidth, low loss and the like of an optical device are fully utilized, and the frequency mixing and filtering cost of the high-frequency radio frequency signal can be reduced. The typical microwave photon down-conversion method firstly performs electro-optical modulation on a received radio frequency signal, then selects a radio frequency local oscillator with a proper frequency to drive a cascaded electro-optical modulator, and then selects an optical wavelength modulated by the radio frequency signal and an optical wavelength modulated by the radio frequency local oscillator to perform optical heterodyne by using a tunable optical filter, thereby realizing the down-conversion of the radio frequency signal. For millimeter wave signal down conversion, not only does the use of two or more lasers increase system cost, but line width and coherence issues of different lasers can cause signal drift. In addition, the signal output by the general microwave photon down-conversion method is usually an intermediate frequency signal, and cannot be combined with a coherent detection technology, so that the performance advantage of coherent detection on weak optical signal detection cannot be exerted.
The traditional microwave photon down-conversion method extracts 1-order sideband wavelength of a carrier signal by using an optical filter, and then realizes photoelectric conversion by using a direct detection or coherent detection method, wherein the central wavelength of the optical filter needs to be adjusted according to the 1-order sideband optical wavelength, and if the change range of the millimeter wave radio frequency carrier frequency is too large, the 1-order sideband optical wavelength exceeds the passband range of the optical filter, the signal power loss is increased until correct demodulation cannot be carried out, namely the bandwidth of a receiver is limited. In addition, the general optical filter has uneven passband, which causes different loss after different optical wavelengths pass through, and also causes the difference of the demodulation performance of the receiver on millimeter wave signals with different carrier frequencies, which is not beneficial to realizing ultra-wideband frequency hopping transmission by millimeter waves.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a broadband high-sensitivity millimeter wave receiving system based on carrier suppression, which is used for generating dual wavelengths by adopting a carrier suppression mode, combining microwave photon down-conversion and combining a homodyne coherent detection technology, realizing the receiving and demodulation of ultra-broadband and high-sensitivity millimeter wave radio frequency signals and supporting the large-capacity and long-distance transmission of millimeter wave wireless communication.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a broadband high-sensitivity millimeter wave receiving system based on carrier suppression, which comprises: the system comprises a carrier suppression dual-wavelength generation structure, an intensity modulator-based microwave photon down-conversion structure and a homodyne coherent detection unit; wherein:
the carrier-rejection-based dual-wavelength generation structure includes: the single-tone signal generated by the microwave source directly drives the intensity modulator, and the intensity modulator works at a carrier suppression point to generate two coherent wave beams;
the microwave photon down-conversion structure based on the intensity modulator comprises: modulating a radio frequency carrier signal to a beam of light wave in a carrier suppression dual-wavelength generating structure by using an intensity modulator, and reserving a-1 order sideband by using Bragg fiber grating filtering;
the homodyne coherent detection unit includes: and performing homodyne coherent detection by using the other beam of light wave generated by the carrier suppression dual-wavelength generating structure and a-1-order sideband output by the microwave photon down-conversion to realize photoelectric conversion and finally complete the demodulation from the millimeter wave radio frequency signal to a baseband signal.
Further, in the carrier suppression based dual wavelength generation structure of the present invention:
the carrier suppression based dual-wavelength generating structure comprises an external cavity laser, an intensity modulator, a microwave signal source, a circulator and a Bragg fiber grating which are connected in sequence; the intensity modulator works at the carrier suppression point, and the microwave signal source generates a frequency f s The single-tone signal drives the optical carrier frequency to be f c An intensity modulator for generating two beams with frequency f c +f s And f c -f s The light beam is used as local oscillator light required by microwave photon down-conversion and homodyne coherent detection.
Further, in the intensity modulator-based microwave photon down-conversion structure of the present invention:
the microwave photon down-conversion structure comprises an intensity modulator, an isolator and a Bragg fiber grating which are connected in sequence; f for carrier suppression generation of optical carriers c +f s The center frequency is set to 2f by an intensity modulator s Modulation of millimeter wave radio frequency signals to intensity1 st order and-1 st order sidebands, f, of the modulator output c +3f s And f c -f s And acquiring a-1 order sideband by using an isolator and a fiber Bragg grating.
Further, in the homodyne coherent detection unit of the present invention:
the homodyne coherent detection unit comprises a coherent receiver, one end of the coherent receiver is connected with the output end of the circulator of the carrier suppression dual-wavelength generation structure, the other end of the coherent receiver is connected with the output end of the Bragg fiber grating in the microwave photon down-conversion structure, and the coherent receiver is used for receiving-1-order sideband f output by the microwave photon down-conversion structure c -f s And carrier suppression to generate another beam of light f c -f s The homodyne coherent detection is carried out, the photoelectric conversion is realized, and the demodulation from the millimeter wave radio frequency signal to a baseband signal is finally completed.
Further, the method for implementing signal demodulation of the present invention specifically comprises:
first, a continuous light wave f generated by an external cavity laser c Injecting into an intensity modulator, the intensity modulator operating at a carrier rejection point and generating a frequency f from a microwave signal source s The single-tone radio frequency signal is subjected to carrier suppression modulation by an intensity modulator to generate a dual wavelength f c ±f s And injecting the optical signal into the port 1 of the optical circulator, and connecting the port 2 of the optical circulator with the bragg fiber grating, so that the optical signals output by the bragg fiber grating and the port 3 of the optical circulator are respectively represented as follows:
E 1 ＝E c {J 1 (β AM1 )cos[2π(f c +f s )t]
E 2 ＝E c {J 1 (β AM1 )cos[2π(f c -f s )t]
wherein E is c Is the output electric field intensity of the light source, f c Is the optical carrier frequency, f s For single tone signal frequencies, here beta AM1 ＝π(V s /V π )，V π Is the half-wave voltage, V, of the intensity modulator s Is the average voltage of the single tone signal, which is used to characterize the modulation index of the first intensity modulator; j. the design is a square 1 Characterizing a first class of Bessel functions having an order of 1; first one isThe output of the intensity modulator is theoretically two beams of frequency f after being separated by the Bragg fiber grating and the optical circulator c ±f s The coherent light of (2);
output signal E of Bragg fiber grating port 1 After being coupled to the intensity modulator for modulation and driven by the millimeter wave radio frequency signal with the baseband signal, the output optical signal is as follows:
E out ＝E 1 cos[β AM2 s(t)cos(2π(2f s )t)]
where s (t) is the transmitted baseband signal, 2f s Is a millimeter wave radio frequency carrier frequency, beta AM2 ＝π(V rf /V π ) The modulation index used to characterize the second AM is 1 Carrying in a formula of the output optical signal and performing Bessel function expansion;
J 2n+1 (β AM2 ) The first Bessel function of the n-order is usually the power of a millimeter wave wireless communication signal receiving end is small, which results in J 2n+1 (β AM2 ) Smaller, and therefore only 1 st order sidebands are generated; namely:
E out ＝E c J 1 (β AM1 )s(t){J 1 (β AM2 )cos[2π(f c -f s )t]+J 1 (β AM2 )cos[2π(f c +3f s )t]}
and after the filtering of the isolator and the Bragg fiber grating, the sideband is taken down, and then the signal light is output as follows:
E sig-out ＝E c s(t)J 1 (β AM1 )J 1 (β AM2 )cos[2π(f c -f s )t]exp[j(w c +nw s )t]
wherein, the signal output by the Bragg fiber grating port and E 2 The center frequencies are the same, and because the same light wave is generated, the light coherence is excellent, and the light can be directly accessed to a coherent receiver for homodyne detection, namely, the demodulation of signals can be realized.
The invention has the following beneficial effects: according to the broadband high-sensitivity millimeter wave receiving system based on carrier suppression, the dual wavelengths generated by the carrier suppression are respectively used as the optical carrier of the millimeter wave radio frequency signals and the local oscillator light of the coherent receiver, so that the sensitivity and the conversion efficiency of microwave photon down-conversion are improved, down-conversion of any millimeter wave radio frequency signal is realized, and the large-capacity and long-distance transmission of millimeter wave wireless communication is supported. The invention solves the problem of broadband demodulation of any millimeter wave carrier frequency in millimeter wave wireless communication, and can be applied to an ultra-wideband millimeter wave wireless communication system. The method has the advantages of simple principle, simple and efficient scheme and high application value.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of a broadband high-sensitivity millimeter wave receiving system based on carrier-suppressed dual-wavelength generation according to an embodiment of the present invention, where ECL denotes an external cavity laser, AM denotes a light intensity modulator, CIR denotes an optical circulator, FBG denotes a bragg fiber grating, and ISO denotes an optical isolator;
FIG. 2 is a comparison of the output signal strength of a microwave photon down-conversion method based on carrier suppression dual-wavelength generation and a conventional method according to an embodiment of the present invention;
fig. 3 is a millimeter wave receiving system scheme based on a conventional microwave photon down-conversion structure according to an embodiment of the present invention, where ECL denotes an external cavity laser, ISO denotes an optical isolator, AM denotes a light intensity modulator, and FBG denotes a fiber bragg grating;
fig. 4 is a diagram illustrating noise performance of a wideband high-sensitivity millimeter wave receiving system scheme based on carrier suppression dual-wavelength generation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The broadband high-sensitivity millimeter wave receiving system based on carrier suppression comprises a carrier suppression dual-wavelength generation structure, a microwave photon down-conversion structure based on an intensity modulator and a homodyne coherent detection unit. Wherein:
the carrier-rejection-based dual-wavelength generation structure includes: the single-tone signal generated by the microwave source directly drives the intensity modulator, and the intensity modulator works at a carrier suppression point to generate two coherent wave beams;
the microwave photon down-conversion structure based on the intensity modulator comprises: modulating a radio frequency carrier signal to a beam of light wave in a carrier suppression dual-wavelength generating structure by using an intensity modulator, and reserving a-1 order sideband by using Bragg fiber grating filtering;
the homodyne coherent detection unit includes: and performing homodyne coherent detection by using another beam of light wave generated by the carrier suppression dual-wavelength generating structure and a-1-order sideband output by the down-conversion of the microwave photons to realize photoelectric conversion and finally complete the demodulation from the millimeter wave radio frequency signal to a baseband signal.
In a dual wavelength generation architecture based on carrier suppression:
the carrier suppression based dual-wavelength generating structure comprises an external cavity laser, an intensity modulator, a microwave signal source, a circulator and a Bragg fiber grating which are connected in sequence; the intensity modulator works at the carrier suppression point, and the microwave signal source generates a frequency f s Driving the light carrier frequency of f with a single tone signal c An intensity modulator for generating two beams with frequency f c +f s And f c -f s The light beam is used as local oscillation light required by microwave photon down-conversion and homodyne coherent detection.
In the microwave photon down-conversion structure based on the intensity modulator:
the microwave photon down-conversion structure comprises an intensity modulator, an isolator and a Bragg fiber grating which are connected in sequence; f for carrier suppression generation of optical carriers c +f s The center frequency is set to 2f by an intensity modulator s Modulating the millimeter wave radio frequency signal to 1 st order and-1 st order sidebands, f, output by the intensity modulator c +3f s And f c -f s And acquiring a-1 order sideband by using an isolator and a fiber Bragg grating.
In the homodyne coherent detection unit:
the homodyne coherent detection unit comprises a coherent receiver, one end of the coherent receiver is connected with the output end of the circulator of the carrier suppression dual-wavelength generation structure, the other end of the coherent receiver is connected with the output end of the Bragg fiber grating in the microwave photon down-conversion structure, and the coherent receiver is used for receiving-1-order sideband f output by the microwave photon down-conversion structure c -f s And carrier suppression to generate another beam of light f c -f s The homodyne coherent detection is carried out, the photoelectric conversion is realized, and finally the demodulation from the millimeter wave radio frequency signal to the baseband signal is completed.
In another embodiment of the invention:
the broadband high-sensitivity millimeter wave receiving system based on carrier suppression dual-wavelength generation adopts carrier suppression to generate coherent dual-wavelength, the dual-wavelength is respectively used as a carrier of a millimeter wave radio frequency signal and a local oscillator for coherent reception, and a homodyne coherent detection technology is combined to realize ultra-wideband millimeter wave radio frequency signal reception and demodulation and support large-capacity and long-distance transmission of millimeter wave wireless communication.
The ultra-wideband in the embodiment of the invention is as follows: the bandwidth of signals carried by millimeter wave radio frequency carriers is wide, and is generally in the range of GHz to tens of GHz.
The high sensitivity in the embodiment of the present invention means: the strength of signals carried by millimeter wave radio frequency carriers is weak, and is generally in the range of-10 dBm to-50 dBm.
Fig. 1 shows a schematic diagram of a broadband high-sensitivity millimeter wave receiving technique based on carrier suppression dual-wavelength generation, in which first, a continuous light wave f generated by an External Cavity Laser (ECL) is used as a continuous light wave f c Injecting into an optical intensity modulator AM, operating at a carrier rejection point, and converting the frequency f generated by a microwave signal source s The single-tone radio frequency signal generates double wavelengths f after AM carrier suppression modulation c ±f s And the optical signal is injected into a CIR port 1, a CIR port 2 and a Fiber Bragg Grating (FBG) to be connected, so that the optical signals output from the FBG and the CIR port 3 are respectively expressed by the following formulas (1) and (2):
E 1 ＝E c {J 1 (β AM1 )cos[2π(f c +f s )t] (1)
E 2 ＝E c {J 1 (β AM1 )cos[2π(f c -f s )t] (2)
wherein E is c Is the output electric field intensity of the light source, f c Is the optical carrier frequency, f s For single tone signal frequencies, here beta AM1 ＝π(V s /V π )(V π Is half-wave voltage of AM, V s Is the average voltage of the single tone signal) to characterize the modulation index of the first AM; j. the design is a square 1 A first type of bessel function of order 1 is characterized. It can be seen that the output of the first AM is theoretically two beams with frequency f after CIR and FBG separation c ±f s The coherent light of (1).
FBG port output signal E 1 After being coupled to AM modulation and driven by millimeter wave radio frequency signals with baseband signals, the output optical signals are as follows:
E out ＝E 1 cos[β AM2 s(t)cos(2π(2f s )t)] (3)
where s (t) is the transmitted baseband signal, 2f s Is a millimeter wave radio frequency carrier frequency, beta AM2 ＝π(V rf /V π ) The modulation index used to characterize the second AM is E in equation (1) 1 Substituting the formula (3) and expanding a Bessel function;
J 2n+1 (β AM2 ) The first Bessel function of the n-order is usually the power of a millimeter wave wireless communication signal receiving end is small, which results in J 2n+1 (β AM2 ) Smaller and therefore typically only 1 order sidebands are generated, so the formula can be expressed as follows:
E out ＝E c J 1 (β AM1 )s(t){J 1 (β AM2 )cos[2π(f c -f s )t]+J 1 (β AM2 )cos[2π(f c +3f s )t]} (5)
after being filtered by an Isolator (ISO) and an FBG, the sideband is removed, and then the signal light is output as follows:
E sig-out ＝E c s(t)J 1 (β AM1 )J 1 (β AM2 )cos[2π(f c -f s )t]exp[j(w c +nw s )t] (6)
the FBG port output signal has the same center frequency as E2, and because the same light wave is generated, the light coherence is excellent, and the signal can be directly accessed to a coherent receiver for homodyne detection, namely, the demodulation of the signal can be realized.
Fig. 2 shows a typical case result implemented by the present invention, a millimeter wave wireless communication system is built, the millimeter wave radio frequency is 35GHz, the modulation format adopts 16-order quadrature amplitude modulation (16QAM), the system baud rate is 2Gbaud, and the receiver detection mode is homodyne coherent detection.
By adopting the technical scheme of broadband high-sensitivity millimeter wave receiving based on carrier suppression dual-wavelength generation shown in fig. 1 and comparing the performance with the millimeter wave receiving scheme of the traditional microwave photon down-conversion structure shown in fig. 3, and as shown in fig. 2, the strength comparison of output signals after two types of microwave photon down-conversion based on an intensity modulator is shown, it can be seen that after the ultra-broadband high-sensitivity millimeter wave based on carrier suppression provided by the invention is adopted, the output response to small signals is obviously enhanced, the insertion loss is small, and as shown in fig. 4, the noise coefficient performance of the system is shown, and it can be seen that the overall noise coefficient of the system is small.
The above embodiment is only a typical application of the present invention, and baseband signal modulation modes of different orders (such as QPSK, 8PSK modulation, etc.), using homodyne coherent detection instead of direct detection, etc. are all specific implementations of the present invention.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A broadband high-sensitivity millimeter wave receiving system based on carrier suppression is characterized in that the system comprises: the system comprises a carrier suppression dual-wavelength generation structure, an intensity modulator-based microwave photon down-conversion structure and a homodyne coherent detection unit; wherein:
the carrier-rejection-based dual-wavelength generation structure includes: the single-tone signal generated by the microwave source directly drives the intensity modulator, and the intensity modulator works at a carrier suppression point to generate two coherent wave beams;
the microwave photon down-conversion structure based on the intensity modulator comprises: modulating a radio frequency carrier signal to a beam of light wave in a carrier suppression dual-wavelength generating structure by using an intensity modulator, and reserving a-1 order sideband by using Bragg fiber grating filtering;
the homodyne coherent detection unit includes: performing homodyne coherent detection by using another beam of light wave generated by the carrier suppression dual-wavelength generation structure and a-1 order sideband output by the microwave photon down-conversion to realize photoelectric conversion and finally completing the demodulation from the millimeter wave radio frequency signal to a baseband signal;
in the carrier-suppression-based dual-wavelength generation structure:
the carrier suppression based dual-wavelength generating structure comprises an external cavity laser, an intensity modulator, a microwave signal source, a circulator and a Bragg fiber grating which are connected in sequence; the intensity modulator works at the carrier suppression point, and the microwave signal source generates a frequency f s Driving the light carrier frequency of f with a single tone signal c An intensity modulator for generating two beams with frequency f c +f s And f c -f s The light beam is used as local oscillation light required by microwave photon down-conversion and homodyne coherent detection;
in the intensity modulator-based microwave photon down-conversion structure:
the microwave photon down-conversion structure comprises an intensity modulator, an isolator and a Bragg fiber grating which are connected in sequence; f for carrier suppression generation of optical carriers c +f s The center frequency is set to 2f by an intensity modulator s Modulation of millimeter wave radio frequency signals to intensity modulation1 st and-1 st order sidebands, f, of the output of the device c +3f s And f c -f s Acquiring a-1-order sideband by using an isolator and a Bragg fiber grating;
in the homodyne coherent detection unit:
the homodyne coherent detection unit comprises a coherent receiver, one end of the coherent receiver is connected with the output end of the circulator of the carrier suppression dual-wavelength generation structure, the other end of the coherent receiver is connected with the output end of the Bragg fiber grating in the microwave photon down-conversion structure, and the coherent receiver is used for receiving-1-order sideband f output by the microwave photon down-conversion structure c -f s And carrier suppression to generate another beam of light f c -f s The homodyne coherent detection is carried out, the photoelectric conversion is realized, and finally the demodulation from the millimeter wave radio frequency signal to the baseband signal is completed.
2. The broadband high-sensitivity millimeter wave receiving system based on carrier suppression as claimed in claim 1, wherein the method for implementing signal demodulation specifically comprises:
first, a continuous wave f generated by an external cavity laser c Injecting into an intensity modulator, the intensity modulator operating at a carrier rejection point and generating a frequency f from a microwave signal source s The single-tone radio frequency signal is subjected to carrier suppression modulation by an intensity modulator to generate a dual wavelength f c ±f s And injecting the optical signal into the port 1 of the optical circulator, and connecting the port 2 of the optical circulator with the bragg fiber grating, so that the optical signals output by the bragg fiber grating and the port 3 of the optical circulator are respectively represented as follows:
E 1 ＝E c {J 1 (β AM1 )cos[2π(f c +f s )t]
E 2 ＝E c {J 1 (β AM1 )cos[2π(f c -f s )t]
wherein E is c Is the output electric field intensity of the light source, f c Is the optical carrier frequency, f s For single tone signal frequencies, here beta AM1 ＝π(V s /V π )，V π Is the half-wave voltage, V, of the intensity modulator s Is the average voltage of the single-tone signal, which is characteristic of the first intensity modulationThe modulation index of the device; j. the design is a square 1 Characterizing a first class of Bessel functions having an order of 1; the output of the first intensity modulator is theoretically divided into two beams with the frequency f after being separated by the Bragg fiber grating and the optical circulator c ±f s The coherent light of (2);
output signal E of Bragg fiber grating port 1 After being coupled to the intensity modulator for modulation and driven by the millimeter wave radio frequency signal with the baseband signal, the output optical signal is as follows:
E out ＝E 1 cos[β AM2 s(t)cos(2π(2f s )t)]
where s (t) is the transmitted baseband signal, 2f s Is a millimeter wave radio frequency carrier frequency, beta AM2 ＝π(V rf /V π ) The modulation index used to characterize the second AM is 1 Carrying in a formula of the output optical signal and performing Bessel function expansion;
J 2n+1 (β AM2 ) The first Bessel function of the n-order is usually the power of a millimeter wave wireless communication signal receiving end is small, which results in J 2n+1 (β AM2 ) Smaller and therefore only 1 st order sidebands are produced; namely:
E out ＝E c J 1 (β AM1 )s(t){J 1 (β AM2 )cos[2π(f c -f s )t]+J 1 (β AM2 )cos[2π(f c +3f s )t]}
and after the filtering of the isolator and the Bragg fiber grating, the sideband is taken down, and then the signal light is output as follows:
E sig-out ＝E c s(t)J 1 (β AM1 )J 1 (β AM2 )cos[2π(f c -f s )t]exp[j(w c +nw s )t]
wherein, the signal output by the Bragg fiber grating port and E 2 The center frequencies are the same, and because the same light wave is generated, the light coherence is excellent, and the light can be directly accessed to a coherent receiver for homodyne detection, namely, the demodulation of signals can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110702603.6A CN113452452B (en) | 2021-06-24 | 2021-06-24 | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110702603.6A CN113452452B (en) | 2021-06-24 | 2021-06-24 | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113452452A CN113452452A (en) | 2021-09-28 |
| CN113452452B true CN113452452B (en) | 2022-09-20 |
Family
ID=77812454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110702603.6A Active CN113452452B (en) | 2021-06-24 | 2021-06-24 | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113452452B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001114A (en) * | 2006-11-21 | 2007-07-18 | 湖南大学 | Full duplex fibre-optical radio communication system of simple structure |
| CN111693988A (en) * | 2020-08-06 | 2020-09-22 | 杭州爱莱达科技有限公司 | Laser millimeter wave integrated distance and speed measuring radar method and device |
| CN111953425A (en) * | 2020-08-04 | 2020-11-17 | 中国舰船研究设计中心 | High-sensitivity photon-assisted ultra-wideband millimeter wave receiver |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568782C (en) * | 2006-09-01 | 2009-12-09 | 上海大学 | The up-down bidirectional transmitting device and the method for transmitting signals of millimeter wave optical fibre transmission system |
| CN101043274A (en) * | 2007-02-07 | 2007-09-26 | 湖南大学 | Modulator-free optical millimeter wave generating method and full-duplex optical fiber wireless communication system |
| CN101414881B (en) * | 2008-09-26 | 2011-08-31 | 上海大学 | Method for generating millimeter wave optical fiber down link device and its frequency tunable millimeter wave |
| CN101420270B (en) * | 2008-11-25 | 2011-02-16 | 北京交通大学 | System for implementing uplink downlink wavelength reusing based on millimeter wave generator |
| CN101567745A (en) * | 2009-04-03 | 2009-10-28 | 湖南大学 | OFDM radio-on-fiber communication system for generating optical millimeter wave by suppressing modulation of optical carrier |
| WO2012050418A1 (en) * | 2010-10-15 | 2012-04-19 | Telekom Malaysia Berhad | All-optical generation of 60 ghz millimeter wave using multiple wavelength brillouin-erbium fiber laser |
| CN102593693B (en) * | 2012-02-03 | 2013-10-23 | 中国科学院半导体研究所 | All-optical microwave multiplier based on non-linear polarization rotation effect |
| CN106027153B (en) * | 2016-05-12 | 2019-07-26 | 西安电子科技大学 | Increase the method that Dare modulator generates 60GHz millimeter wave based on novel double-side band Mach |
| CN107565305B (en) * | 2017-08-24 | 2019-11-22 | 华中科技大学 | The optical-electronic oscillator of wideband adjustable based on cascade microwave photon filter |
| CN107947864B (en) * | 2017-12-04 | 2020-02-18 | 大连理工大学 | Photon microwave down-conversion device and method |
-
2021
- 2021-06-24 CN CN202110702603.6A patent/CN113452452B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001114A (en) * | 2006-11-21 | 2007-07-18 | 湖南大学 | Full duplex fibre-optical radio communication system of simple structure |
| CN111953425A (en) * | 2020-08-04 | 2020-11-17 | 中国舰船研究设计中心 | High-sensitivity photon-assisted ultra-wideband millimeter wave receiver |
| CN111693988A (en) * | 2020-08-06 | 2020-09-22 | 杭州爱莱达科技有限公司 | Laser millimeter wave integrated distance and speed measuring radar method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113452452A (en) | 2021-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109831258B (en) | Photon radio frequency receiver with image frequency suppression function | |
| CN101964683B (en) | Serial-parallel connection modulation optical frequency multiplication millimeter-wave RoF (Radio Over Fiber) system and QPSK (Quadrature Phase Shift Keying) /16QAM (Quadrature Amplitude Modulation) modulation method thereof | |
| US8923702B2 (en) | Signal receiving method based on microwave photonics technologies | |
| EP2813010B1 (en) | Photonic rf generator | |
| CN111953425B (en) | High-sensitivity photon-assisted ultra-wideband millimeter wave receiver | |
| CN110958053B (en) | Device and method for generating quad-frequency optical millimeter wave BPSK vector signal | |
| US11923908B2 (en) | Integrated coherent receiver with off PLL bandwidth demodulation | |
| CN101674136B (en) | Optical frequency-doubling millimeter wave RoF signal generation system and method of OFDM modulation mode | |
| CN112448771B (en) | Microwave photon broadband receiver | |
| Uemura et al. | 600-GHz-band heterodyne receiver system using photonic techniques | |
| CN113452452B (en) | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression | |
| CN112350777A (en) | Double-vector millimeter wave generation system and method based on push-pull modulator | |
| CN111953426B (en) | Photon-assisted ultra-wideband millimeter wave receiver based on Sagnac ring | |
| CN109361469B (en) | Millimeter wave generation system and method based on quantum dot laser | |
| CN113438030B (en) | Polarization-insensitive photon-assisted millimeter wave coherent receiving device | |
| US9912410B1 (en) | Optical radio-frequency down-conversion and remoting | |
| Li et al. | 16-QAM vector terahertz-wave signal generation by simple MZM-based optical frequency comb | |
| CN114448518A (en) | Method for detecting optical carrier radio frequency link with low complexity coherence | |
| CN106877940B (en) | Optical signal transmitting end and millimeter wave optical carrier wireless communication system | |
| CN111224720A (en) | Terahertz vector signal generation system and method of cascade connection of dual-intensity modulator | |
| CN115333639B (en) | Dual-output microwave photon quaternary frequency shift keying signal generation device and method | |
| CN113037389B (en) | High frequency multiplication millimeter wave signal generating device based on DPMZM and FWM effects | |
| CN113507327B (en) | Photon-assisted communication perception integrated device | |
| CN114978331B (en) | Microwave millimeter wave signal transmitting system based on optical heterodyne | |
| Kawanishi et al. | 160GHz two-tone lightwave generation using high extinction-ratio optical modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |